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EP1167872A1 - Source lumineuse plane - Google Patents

Source lumineuse plane Download PDF

Info

Publication number
EP1167872A1
EP1167872A1 EP00911414A EP00911414A EP1167872A1 EP 1167872 A1 EP1167872 A1 EP 1167872A1 EP 00911414 A EP00911414 A EP 00911414A EP 00911414 A EP00911414 A EP 00911414A EP 1167872 A1 EP1167872 A1 EP 1167872A1
Authority
EP
European Patent Office
Prior art keywords
light
light source
guide plate
light guide
surface illuminant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00911414A
Other languages
German (de)
English (en)
Other versions
EP1167872A4 (fr
Inventor
Hideharu Osawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rohm Co Ltd
Original Assignee
Rohm Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP11086405A external-priority patent/JP2000285718A/ja
Priority claimed from JP11086342A external-priority patent/JP2000284280A/ja
Application filed by Rohm Co Ltd filed Critical Rohm Co Ltd
Publication of EP1167872A1 publication Critical patent/EP1167872A1/fr
Publication of EP1167872A4 publication Critical patent/EP1167872A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide

Definitions

  • the present invention relates to a surface illuminant including light emitting diodes (LEDs) and the like which are used as a light source and in particular to a surface illuminant which is capable of emitting a desired color light and is capable of reducing the electric power consumption.
  • LEDs light emitting diodes
  • LED back light sources using a reflection plate have been widely used as a surface illuminant for compact display used for, for example, cellular phones.
  • Fig. 6 is an exploded perspective view showing a prior art surface illuminant which is exploded.
  • a reference numeral 101 denotes a light source comprising, for example, LEDs or CFL (cold fluorescent tubes);
  • 102 denotes a light guide plate which is adjacent to said light source.
  • the light guide plate 102 is formed of a white and transparent plate made of polycarbonate or acrylic resin, etc.
  • the light guide plate 102 has a flat face from which light is emitted and a reverse face on which a multiplicity of prism-like grooves in which the distance between the grooves becomes narrower as it is more distant from the light source are formed as shown in the drawing by etching or sand blast process, so that the light from the light source will be reflected on the faces of the grooves for uniformly emitting light from the entire surface of the light guide plate 102.
  • a reference 103 denotes a white reflective film made of an appropriate synthetic resin such as polyester (PET), polycarbonate, which is bonded to the edge of the reverse side of the light guide plate 102 with a both-sided adhesive tape.
  • PET polyester
  • the film 103 reflects the light which has been transmitted through the faces of the grooves having prism-like cross section for guiding the light to the light guide plate 102 again so that it is emitted externally from the surface of the light guide plate 102.
  • the light from the light source 101 is transmitted through the light guide plate 102 and is then reflected on the prism-like faces formed on its reverse side or alternatively it is transmitted through the prism-like face and is reflected on the reflective film 103, and is incident upon the light guide plate 102, where it is mixed with the reflected light for substantially uniformly illuminating the entire surface of the light guide plate 102.
  • the light from the light source is emitted as back light having unchanged color since the light guide plate is colorless and transparent.
  • the fluorescent scattering layer should be applied (printed) on the light guide plate since the fluorescent material is directly applied upon the light guide plate in the surface illuminant as set forth inparagraph (1). Since the color tone may change depending upon the mixture ratio between the fluorescent material and white powder for scattering fluorescent light, a desired color can not be readily obtained.
  • the first means resides in a surface illuminant comprising a light source, a light guide plate which is optically coupled to said light source for emitting light incident from said light source through one side thereof; and a reflective film which is disposed on the other side of said light in which a wave length converting material is applied on said reflective film.
  • the reflective film per se may be prior art white color reflective film. Accordingly, the surface illuminant of white and intermediate color can be readily obtained. The surface illuminant of desired color can be obtained by merely changing the reflective film.
  • the second means resides in a surface illuminant comprising a light source, alight guide plate which is optically coupled to said light source for emitting light incident from said light source through one side thereof; and a reflective film which is disposed on the other side of said light guide in which said reflective film comprises a light storage material.
  • the reflective film of the surface illuminant includes a light storage film in the surface illuminant of the second means, the surface illuminant is capable of continuously emitting light even if the light source is turned off for a predetermined period of time. The power consumption of the surface illuminant can be remarkably reduced.
  • the third means resides in a surface illuminant comprising a light source, a light guide plate which is optically coupled to said light source for emitting light incident from said light source through one side thereof; and a reflective film which is disposed on the other side of said light guide in which said light guide plate is made of a transparent material in which a light storage material is blended.
  • the surface illuminant of the third means Since the light guide plate into which the light storage material is incorporated is provided in the surface illuminant of the third means, the surface illuminant which is capable of storing light can be readily obtained without specially treating the prepared light guide plate. Since the surface illuminant is capable of emitting light even if the light source is turned off, the power consumption of the surface illuminant ca be remarkably reduced.
  • the fourth means resides in a surface illuminant comprising a light source, a light guide plate which is optically coupled to said light source for emitting light incident from said light source through one side thereof; and a reflective film which is disposed on the other side of said light guide in which a light storage material is formed on the surface of said light guide plate.
  • the concentration of the light storage material, that is the amount of stored light can be relatively easily adjusted by controlling the amount of the applied light storage material.
  • the fifth means resides in a surface illuminant of the fourth means in which the concentration of the light storage material in said light storage layer is increased from its one end adjacent to the light source to the other end thereof.
  • the illumination of the surface illuminant can be kept substantially uniform over the entire surface thereof by compensating for the attenuation of the light emitted to the light guide plate from the light source due to the fact that the concentration of the light storage material in the light guide plate is increased in accordance with the distance from the light source.
  • Fig. 1 shows first and second embodiments of the present invention.
  • reference numerals 11 , 12 and 13 denote a light source; a light guide plate made of a colorless transparent synthetic resin such as polycarbonate or acrylic resin, which is formed on its reverse side with prism-like grooves; and a reflective film made of PET or polycarbonate, respectively.
  • the light guide plate 12 is substantially rectangular in shape.
  • the light source 11 is disposed adjacent to the light guide plate 12 so that light is incident upon one end face of the light guide plate 12 from, for example blue color LEDs.
  • the reflective film 13 is disposed to cover the reverse side of the light guide plate 12.
  • a wave length converting layer 14 is provided on the reflective film 13.
  • the wave length converting layer 14 is formed by applying a solution of a wave-length converting material such as a fluorescent material which is excited on exposure to ultraviolet rays from the light source such as YAG for emitting fluorescent light.
  • the solution contains the wave length material, a resin such as acrylic resin and a proper solvent. Accordingly, when, for example, the blue color LEDs are used as the light source 11, the ultraviolet rays from the blue color LEDs are subjected to wave length conversion, so that fluorescent light is emitted.
  • the light guide plate 12 which is formed with convexes and concaves having different densities and sizes depending upon the distance from the light source by embossing in lieu of the prism-like grooves on the reverse side thereof.
  • a fluorescent material which is obtained by mixing equal amounts of red and green fluorescent pigments which emits yellow color light on exposure to ultraviolet rays is used.
  • a surface illuminant which is capable of emitting critical and delicate intermediate color light which has been heretofore difficult to obtain can be provided by appropriately selecting the fluorescent material 14 and the wave length of the light source 11.
  • the power consumption of the surface illuminant can be made less.
  • the surface illuminant comprises a light storage material (a material which absorbs the light rays emitted from the light source for emitting light for a predetermined period of time after light rays from the light source disappear, for example, "N YAKOH” (trade name) manufactured by Nemoto Kagaku Co. Ltd.) in lieu of the reflective film.
  • a light storage material a material which absorbs the light rays emitted from the light source for emitting light for a predetermined period of time after light rays from the light source disappear, for example, "N YAKOH” (trade name) manufactured by Nemoto Kagaku Co. Ltd.
  • the reflective film made of a synthetic resin includes a light storage material 15.
  • the light storage material 15 which is in the form of a solution including a resin as a binder and an appropriate solvent similarly to the case of said fluorescent material is applied on the reflective film or alternatively the light storage material 15 is incorporated in the transparent (transmissive) reflective film. If the light storage material is incorporated in the reflective film, a reflective layer having white color is formed on the lower side of the reflective film. If the light storage material is applied on the reflective film, the light storage material to be used specifically may include, for example, "CHIKKO INK” and "N YAKOH CHIKKO INK” (trade names) manufactured by Teikoku Ink Co. Ltd.
  • the light source of, for example, blue light LEDs When the light source of, for example, blue light LEDs is lit in the arrangement of the second embodiment, part of the light which is incident on the light guide plate is transmitted through the prism like face of the light guide plate and impinges on the reflective film 13. At this time, part of the impinged light is stored by the light storage material 15 of the reflective film.
  • the stored light will be emitted for a predetermined period of time after turning off the light source since the surface illuminant of the present invention is capable of emitting light for a predetermined period of time by the spontaneously emitted light from the light storage material after the turning off of the light source in such a manner, the surface illuminant can continuously emit light by repeating turning on and off the light source as shown in Fig. 2.
  • the power consumption can be remarkably reduced in comparison with the prior art since it is not necessary to continuously turn on the light source.
  • the illumination of the surface illuminant can be kept uniform over the entire of the light emitting surface by increasing the amount of the applied light storing material 15 on the reflected film depending upon the distance from the light source to compensate for the attenuation of the light emitted into the light guide plate from the light source.
  • Fig. 3 shows a third embodiment of the present invention.
  • reference numerals 31 , 32 and 33 denote a light source; a light guide plate made of a colorless transparent synthetic resin such as polycarbonate or acrylic resin, which is formed on its reverse side prism-like grooves; and a reflective film made of PET or polycarbonate, respectively.
  • the light guide plate 32 is substantially rectangular in shape.
  • the light source 31 is disposed adjacent to the light guide plate 32 so that light is incident upon one end face of the guide plate 32 from , for example blue color LEDs.
  • the reflective film 33 is disposed to cover the reverse side of the light guide plate 32.
  • the structure is substantially identical with that of theprior art shown in Fig. 6.
  • the light guide plate 32 is made of a colorless transparent synthetic resin such as polycarbonate or acrylic resin, in which a light storage material 34 is incorporated.
  • the light guide plate 32 which is formed with convexes and concaves having different densities and sizes depending upon the distance from the light source by embossing in lieu of the prism-like grooves on the reverse side thereof.
  • Fig. 4 shows a fourth embodiment of the present invention.
  • reference numerals 41, 42 and 43 denote a light source; a light guide plate made of a colorless transparent synthetic resin such as polycarbonate or acrylic resin, which is formed on its reverse side prism-like grooves; and a reflective film made of PET or polycarbonate, respectively.
  • Reference numerals 44 and 45 denote light storage material and a light storage layer, respectively.
  • the fourth embodiment is substantially identical with the third embodiment in that the light guide plate 42 is made of a colorless transparent synthetic resin such as polycarbonate or acrylic resin, which is blended with a light storage material although it is different from the third embodiment in that the light storage layer 45 is formed by applying the light storage material on the face side and/or reverse side of the light guide plate.
  • a colorless transparent synthetic resin such as polycarbonate or acrylic resin
  • Fig. 5 shows a fifth embodiment of the present invention.
  • reference numerals 51, 52 and 53 denote a light source; a light guide plate made of a colorless transparent synthetic resin such as polycarbonate or acrylic resin, which is formed on its reverse side prism-like grooves; and a reflective film made of PET or polycarbonate, respectively.
  • a reference numeral 54 denotes light storage layer.
  • the fifth embodiment shows one example of detailed means for increasing the concentration of the light storage layer from one end adjacent to the light source to the other end so that the concentration of the light storage layer 54 of the light guide layer 52 is increased depending upon the distance from the light source 51.
  • a plurality of stripes of ink each having different concentration of the light storage material which are applied from one end adjacent to the light source to the other end when such an arrangement is adopted, the illumination of the surface illuminant can be kept uniform over the entire light emitting surface by the light storage layer compensating for the attenuation of the light since the amount of the relative stored light in the light guide plate is reversely proportional to the distance from the light source even if the light incident upon the light guide plate attenuates as it travels far from the light source.
  • the present invention is not limited to those embodiments.
  • the light guide plate which is not blended with the light storage material may be used.
  • a solvent of the light storage material is prepared by mixing it with a resin binder and an appropriate solvent.
  • the solvent is applied on the face and reverse sides of the light guide plate.
  • the light storage material to be used specifically may include, for example, "CHIKKO INK” and “N YAKOH CHIKKO INK” (trade names) manufactured by Teikoku Ink Co. Ltd.
  • the light source 21, 31, 41, 51 is lit in the arrangement in Fig.1, 3, 4, 5, part of the light which is incident on the light guide plate is stored in the light storage material 15 of the reflective film, the light storage material 34, 44, 54 in the light guide plate and/or the light storage layer 45 applied on the face and reverse sides of the light storage plate.
  • the stored light is emitted for a predetermined period of time after turning off the light source since the surface illuminant of the present invention is capable of emitting light for a predeterminedperiod of time after the turning off of the light source.
  • the surface illuminant of the present invention is capable of emitting light for a certain period of time by the spontaneously emitted light from the light storage material after turning off of the light source, the surface illuminant is capable of uniformly and continuously emitting light by repeating turning on or off of the light source as shown in Fig.2.
  • the power consumption can be remarkably reduced in comparison with the prior art since it is not necessary to continuously turn on the light source.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
EP00911414A 1999-03-29 2000-03-28 Source lumineuse plane Withdrawn EP1167872A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP8634299 1999-03-29
JP8640599 1999-03-29
JP11086405A JP2000285718A (ja) 1999-03-29 1999-03-29 面状光源
JP11086342A JP2000284280A (ja) 1999-03-29 1999-03-29 面状光源
PCT/JP2000/001900 WO2000058665A1 (fr) 1999-03-29 2000-03-28 Source lumineuse plane

Publications (2)

Publication Number Publication Date
EP1167872A1 true EP1167872A1 (fr) 2002-01-02
EP1167872A4 EP1167872A4 (fr) 2002-07-31

Family

ID=26427482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00911414A Withdrawn EP1167872A4 (fr) 1999-03-29 2000-03-28 Source lumineuse plane

Country Status (3)

Country Link
US (1) US7108416B1 (fr)
EP (1) EP1167872A4 (fr)
WO (1) WO2000058665A1 (fr)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6943380B2 (en) 2000-12-28 2005-09-13 Toyoda Gosei Co., Ltd. Light emitting device having phosphor of alkaline earth metal silicate
US7138660B2 (en) 2000-12-28 2006-11-21 Toyoda Gosei Co., Ltd. Light emitting device
US7157746B2 (en) 2000-12-28 2007-01-02 Toyoda Gosei Co., Ltd. Light emitting device having a divalent-europium-activated alkaline earth metal orthosilicate phosphor
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GB2425168A (en) * 2005-04-15 2006-10-18 Taiwan Green Point Entpr Co Lt Table lamp having planar light guide
WO2013159376A1 (fr) * 2012-04-27 2013-10-31 深圳市华星光电技术有限公司 Module de rétroéclairage et dispositif d'affichage à cristaux liquides

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EP1167872A4 (fr) 2002-07-31
WO2000058665A1 (fr) 2000-10-05
US7108416B1 (en) 2006-09-19

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